Wheel well is being used as a generic term, I do not know of many aircraft where there is a space to hide in a wheel well that will not dump or crush a person upon gear retraction. All aircraft I have worked with have sub structure aft of the wing spar, O/B of the wheel well and I/B of the MLG trunion, on a wide body aircraft there is plenty of space for a human. Dropping the W/W doors will do you little good to view this area, often it may be possible for someone to climb up the gear and enter this area, the only way to inspect it is usually by climbing up on a tire or using a ladder.